CCI vs Remington primers for 300 win mag

I'm new to a 300 win mag and also to reloading. I'm trying to reload for as much accuracy as I can get. I have CCI large rifle magnum primers and Remington large rifle magnum primers. Which one is going to be best for accuracy??? I've heard that Federal Gold Match primers are the cats meow, but of course I can't get any.

I'm having a Winchester model 70 rebarelled with a match grade barrel and bedded trying to get as much accuracy as possible. I'm using Norma brass and sorting the brass by weight, deburring the flash hole, uniforming the primer pocket, cleaning the brass with a sonic cleaner, sorting the bullets by bearing surface and measuring each powder charge to within .1 grain. I won't know how close to the riflings I can get with the bullets until I get the rifle back.

I'm new to a 300 win mag and also to reloading. I'm trying to reload for as much accuracy as I can get. I have CCI large rifle magnum primers and Remington large rifle magnum primers. Which one is going to be best for accuracy??? I've heard that Federal Gold Match primers are the cats meow, but of course I can't get any.

I'm having a Winchester model 70 rebarelled with a match grade barrel and bedded trying to get as much accuracy as possible. I'm using Norma brass and sorting the brass by weight, deburring the flash hole, uniforming the primer pocket, cleaning the brass with a sonic cleaner, sorting the bullets by bearing surface and measuring each powder charge to within .1 grain. I won't know how close to the riflings I can get with the bullets until I get the rifle back.

Any advice would be appreciated.
Thanks.

Try them both and run the one that produces the best results. There is no one solid answer for every rifle. It's a matter of trial and error for all of us.

Each type of primer uses a different mix when they produce their primers and has a much different burn column and degree of how hot it is. Sometimes a change in primer can dial-in a load when you're really close. Testing the load for accuracy using different primers is usually the last thing I change after every thing else.

There are only 2 things I can tell you, first off the CCIs tend to have a harder cup (usually!), second the CCI250 is as close as you are going to get to Fed215s, rem9 1/2Ms are closer to standard winchester Large Rifle, and WLRMs aren't much warmer than the standard LR. You will likely find the remingtons to work better with the faster powders and the CCIs with the slower ones, but as already stated its a matter of trial an error.

I tend to agree with Backwoods, as I find RP 9 1/2s and 9 1/2Ms tend to be a little "softer" shooting. There are a lot of times when changing to the RPs that my velocities drop a bit...In other words, I MAY put 1.0-1.5 grains more powder in a .300Mag to bring the velocity up to where it was with Federal 215s...not quite so much with CCI 200s.
Have fun,
Gene